That "groan" emoji is well over due...
Anyway...Looks around living room...Yup, several chunks of Lewisian gneiss on show, likewise bathroom, bedroom...
Bathroom ones are my favourite, as they run from distinctly pre-gneiss garnet-mica schist, through various further stages of metamorphosis and re-metamorphosis to full on banded gneiss. There's even a piece of banded Strontian granite next to one of the mediumly banded bits in the bathroom.
And then there are the weird bits of flint from around Walberswick and Dunwich, which look like aliens.
Not to forget the Icelandic obsidian from the hills above Akureyri and the piece of pahoehoe type lava from a lava field near Reykjavik.
Have I mentioned I quite like geology?